Higher Chemistry

I cannot, for some reason, work out how to get the answer to question 4 of the 2001 Higher Chemistry paper. Can anyone help?

Q) A mixture of sodium bromide and sodium sulphate is known to contain 5 mol of sodium and 2 mol of bromide ions.

How many moles of sulphate ions are present?

A) 1.5
B) 2.0
C) 2.5
D) 3.0

The correct answer is A but I don't know how to get it!

Reply 1

joostan

13

Original post by agmcleish

I cannot, for some reason, work out how to get the answer to question 4 of the 2001 Higher Chemistry paper. Can anyone help?

Q) A mixture of sodium bromide and sodium sulphate is known to contain 5 mol of sodium and 2 mol of bromide ions.

How many moles of sulphate ions are present?

A) 1.5
B) 2.0
C) 2.5
D) 3.0

The correct answer is A but I don't know how to get it!